Gpower Yellow/Black 20A 3000mAh 18650 Bench Test Results...a poor performing 17A 2800mAh battery

Discussion in 'Batteries and Chargers' started by Mooch, Nov 30, 2016.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    The two cells tested were donated by Gpower (Gpower Battery- Gpower 18650 26650 li ion battery and battery charge wholesale) for the purposes of testing. Thank you! To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18350, 18650, 26650, etc.

    While the test results are hard data, the conclusions and recommendations I make based on these tests are only my personal opinion based on my criteria for setting a rating. Carefully research any cell you are considering using before purchasing.

    Testing cells at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved and how to minimize them.

    If the cell has only one current rating number on it, or if it says "max discharging current" then I have to assume that the company is stating that the cell can be discharged at that current level in any way, including continuously.

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    Bottom Line
    This tested out as a poor performing 17A 2800mAh cell. The 20A 3000mAh Samsung 30Q delivers about 1600mAh at 20A down to 3.2V. This Gpower only delivers about 790mAh. And that was only after two cycles at moderate current levels to "break it in", something that should never be required.

    This cell doesn't match the appearance or performance and of any Samsung, Sony, LG, Panasonic, or Sanyo battery I have seen. It appears to be a China-manufactured cell and not a rewrap. It has "ICR" on the wrap but I don't know which battery chemistry they're using. "ICR" is used for both the chemistry that is in LiPo's, lithium-cobalt (LCO), and for the "hybrid" chemistry that is in 25R's, HE2/4's, VTC's, and other batteries, nickel-manganese-cobalt (NMC).

    While the cell does list the continuous current rating in very small print on the "back" of the wrap it has its useless "pulse" rating in huge print on the "front" of the wrap. I feel this is misleading and I encourage all battery companies that sell to the vaping community to only use the continuous current rating in large print or to use both, e.g., "20A/40A" for this cell.

    I am giving this cell a Maximum Vaping Amps (MVA) rating of 20A. The voltage sag is already pretty bad at this level though. The 18650 ratings table has been updated to include this cell.

    Continuous-Current Test Results

    Pulse-Current Test Results
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    • At 10A continuous it reached 2575mAh. This is poor performance for a 3000mAh cell at 10A so I am rating it at 2800mAh.
    • At 15A continuous the temperature rose to 72°C. This is below the average temperature of a cell operating at its continuous discharge rating (CDR). This is an indication that we are operating below its true rating.
    • At 20A continuous the temperature rose to 88°C. This is 10°C above the average temperature of a cell operating at its CDR and is an indication that we are operating at above its true rating.
    • At 25A continuous the temperature rose to 110°C and the voltage sag is huge. This is an indication that we are operating at way above its true rating.
    • At 30A continuous the cell is essentially useless.
    • I am setting a CDR of 17A for this cell. While operating any cell near its rated maximum current level causes damage, I would expect ok cycle life at 17A continuous.
    To see how other cells have tested and how hard you can safely push them, check out these links:
    List of Battery Tests | E-Cigarette Forum
    sonicbomb likes this.

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